Python - Using pandas to format excel cell

Question

I have a pandas dataframe, which is something like shown below.

I would like to format the column \"Pass/Fail\" as if Fail --> red background, else

Answer 1

If have one or more columns and more than two values to format, and want to apply multiple format rules at once then you can do the following:

def fmt(data, fmt_dict):
    return data.replace(fmt_dict)

styled = df.style.apply(fmt, fmt_dict=fmt_dict, subset=['Test_1', 'Test_2' ])
styled.to_excel('styled.xlsx', engine='openpyxl')

Above, fm_dict is a dictionary with the values mapped to the corresponding format:

fmt_dict = {
    'Pass': 'background-color: green',
    'Fail': 'background-color: red',
    'Pending': 'background-color: yellow; border-style: solid; border-color: blue'; color: red,
}

Notice that for the 'Pending' value, you can also specify multiple format rules (e.g. border, background color, foreground color)

(Requires: openpyxl and jinja2)

---

Here is a full running example:

import pandas as pd

df = pd.DataFrame({'Test_1':['Pass','Fail', 'Pending', 'Fail'],
                   'expect':['d','f','g', 'h'],
                   'Test_2':['Pass','Pending', 'Pass', 'Fail'],
                  })

fmt_dict = {
    'Pass': 'background-color: green',
    'Fail': 'background-color: red',
    'Pending': 'background-color: yellow; border-style: solid; border-color: blue; color:red',
}

def fmt(data, fmt_dict):
    return data.replace(fmt_dict)

styled = df.style.apply(fmt, fmt_dict=fmt_dict, subset=['Test_1', 'Test_2' ])
styled.to_excel('styled.xlsx', engine='openpyxl')